Fix Dockerfile syntax error and ensure docker-entrypoint.sh exists

docker-entrypoint.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+if [ ! -e "config/config.yaml" ]; then
+    echo "Resource not found, copying from defaults: config.yaml"
+    cp -r "default/config.yaml" "config/config.yaml"
+fi
+
+# Start the server
+exec node server.js --listen "$@"